ssh-agent.sh

## SSH agent stuff - pilfered from github
# https://help.github.com/articles/working-with-ssh-key-passphrases/#auto-launching-ssh-agent-on-msysgit
# Note: ~/.ssh/environment should not be used, as it
#       already has a different purpose in SSH.

env=~/.ssh/agent.env

if [ ! -f "$env" ]; then
  touch "$env"
fi

# Note: Don't bother checking SSH_AGENT_PID. It's not used
#       by SSH itself, and it might even be incorrect
#       (for example, when using agent-forwarding over SSH).

agent_is_running() {
    if [ "$SSH_AUTH_SOCK" ]; then
        # ssh-add returns:
        #   0 = agent running, has keys
        #   1 = agent running, no keys
        #   2 = agent not running
        ssh-add -l >/dev/null 2>&1 || [ $? -eq 1 ]
    else
        false
    fi
}

agent_has_keys() {
    ssh-add -l >/dev/null 2>&1
}

agent_load_env() {
    . "$env" >/dev/null
}

agent_start() {
    (umask 077; ssh-agent >"$env")
    . "$env" >/dev/null
}

if ! agent_is_running; then
    agent_load_env
fi

# if your keys are not stored in ~/.ssh/id_rsa or ~/.ssh/id_dsa, you'll need
# to paste the proper path after ssh-add
if ! agent_is_running; then
    agent_start
    for file in $(grep IdentityFile ~/.ssh/config | awk '{print $2}') ;
      do ssh-add "$file"; 
    done

elif ! agent_has_keys; then
    for file in $(grep IdentityFile ~/.ssh/config | awk '{print $2}') ;
      do ssh-add "$file";
    done

fi

unset env